US4774923A - Pressure regulating valve - Google Patents

Pressure regulating valve Download PDF

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Publication number
US4774923A
US4774923A US07/116,550 US11655087A US4774923A US 4774923 A US4774923 A US 4774923A US 11655087 A US11655087 A US 11655087A US 4774923 A US4774923 A US 4774923A
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United States
Prior art keywords
fuel
pressure
valve
temperature
temperature sensitive
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US07/116,550
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English (en)
Inventor
Kenji Hayashi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Aisan Industry Co Ltd
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Aisan Industry Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP61266195A external-priority patent/JPS63120857A/ja
Priority claimed from JP61266194A external-priority patent/JPS63120856A/ja
Application filed by Aisan Industry Co Ltd filed Critical Aisan Industry Co Ltd
Assigned to AISAN KOGYO KABUSHIKI KAISHA reassignment AISAN KOGYO KABUSHIKI KAISHA ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: HAYASHI, KENJI
Application granted granted Critical
Publication of US4774923A publication Critical patent/US4774923A/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
    • F02M69/46—Details, component parts or accessories not provided for in, or of interest apart from, the apparatus covered by groups F02M69/02 - F02M69/44
    • F02M69/54—Arrangement of fuel pressure regulators
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D16/00—Control of fluid pressure
    • G05D16/04—Control of fluid pressure without auxiliary power
    • G05D16/06—Control of fluid pressure without auxiliary power the sensing element being a flexible membrane, yielding to pressure, e.g. diaphragm, bellows, capsule
    • G05D16/063—Control of fluid pressure without auxiliary power the sensing element being a flexible membrane, yielding to pressure, e.g. diaphragm, bellows, capsule the sensing element being a membrane
    • G05D16/0644—Control of fluid pressure without auxiliary power the sensing element being a flexible membrane, yielding to pressure, e.g. diaphragm, bellows, capsule the sensing element being a membrane the membrane acting directly on the obturator
    • G05D16/0655—Control of fluid pressure without auxiliary power the sensing element being a flexible membrane, yielding to pressure, e.g. diaphragm, bellows, capsule the sensing element being a membrane the membrane acting directly on the obturator using one spring-loaded membrane
    • G05D16/0661—Control of fluid pressure without auxiliary power the sensing element being a flexible membrane, yielding to pressure, e.g. diaphragm, bellows, capsule the sensing element being a membrane the membrane acting directly on the obturator using one spring-loaded membrane characterised by the loading mechanisms of the membrane
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/06—Fuel or fuel supply system parameters
    • F02D2200/0606—Fuel temperature

Definitions

  • the present invention relates to a pressure regulating valve, and more particularly to a pressure regulating valve primarily for use with a fuel injection device for an automotive internal combustion engine.
  • FIG. 1 shows a known fuel injection system for an automotive internal combustion engine.
  • a pressure regulating valve 2 is provided upstream of a fuel injection valve 1 to maintain an absolute fuel pressure at a value higher than an absolute intake manifold pressure by a fixed value (normally 2.55 kg/cm 2 ).
  • a fuel pressure to be hereinafter referred means a gauge pressure obtained by subtracting an atmospheric pressure from the absolute fuel pressure
  • an intake manifold pressure to be hereinafter referred means a vacuum obtained by subtracting the absolute intake manifold pressure from the atmospheric pressure.
  • the fuel injection system shown in FIG. 1 includes a fuel tank 3, a fuel pump 4, a fuel filter 5, a fuel damper 6 and a surge tank 7. A suction air is induced in the direction of arrow as shown.
  • a vacuum passage 8 is provided to induce a vacuum in the surge tank 7 into the fuel regulating valve 2.
  • a fuel passage 9 is provided to communicate the fuel pump 4 with the fuel injection valve 1 and the pressure regulating valve 2.
  • a fuel return passage 10 is provided to return an excessive fuel to the fuel tank 3.
  • FIG. 2 is a vertical sectional view of the conventional pressure regulating valve 2.
  • a diaphragm 13 is fixed between upper and lower casings 11 and 12 to define a diaphragm chamber 14 in the upper casing 11 and a fuel chamber 15 in the lower casing 12.
  • a diaphragm spring 16 is inserted in the diaphragm chamber 14, and a spring force of the diaphragm spring 16 is set to a value such that the absolute fuel pressure is regulated to be always higher than the absolute intake manifold pressure by a fixed value (normally 2.55 kg/cm 2 ) by means of a pressure regulating mechanism to be hereinafter described.
  • the casing 11 is connected with a vacuum connection pipe 17 communicated through the vacuum passage 8 to the surge tank 7 (see FIG. 1).
  • the casing 12 is connected at its side portion with a fuel inlet connection pipe 18 communicated through the fuel passage 9 to the fuel injection valve 1 and the fuel pump 4 (see FIG. 1).
  • the casing 12 is also connected at its axial portion with a fuel outlet connection pipe 19 in such a manner that the upper end portion of the fuel outlet connection pipe 19 projects into the casing 12 and is provided with a seat member 20.
  • a valve member 21 is mounted at a central portion of the diaphragm 13 to open and close the fuel outlet by the reciprocation of the diaphragm 13.
  • a low-boiling point fuel such as alcohol containing fuel and high reed vapor pressure fuel has been recently utilized.
  • Such a low-boiling point fuel generates a vapor at a fuel temperature of about 80° C.
  • the temperature of fuel in the fuel pipe is greatly increased to cause the generation of fuel vapor.
  • the fuel pressure should be set to 3.5 kg/cm 2 at the fuel temperature of about 80° C. in order to prevent the vaporization.
  • a pressure regulating valve which is designed to increase a fuel pressure up to a certain value (3.5 kg/cm 2 , for example) only when a fuel temperature increases to a value higher than a predetermined temperature (about 80° C., for example), thereby preventing the vaporization of the fuel even in using a low-boiling point fuel.
  • a pressure regulating valve for regulating a pressure of fuel to be supplied to a fuel injection device, comprising a diaphragm chamber having a connecting portion for inducing an intake manifold vacuum in the vicinity of a nozzle hole of the fuel injection device, a fuel chamber having a connecting portion for inducing a fuel and located adjacent to the diaphragm chamber, a diaphragm for partitioning the diaphragm chamber from the fuel chamber, a diaphragm spring accommodated in the diaphragm chamber and biasing the diaphragm toward the fuel chamber, a valve member mounted to the diaphragm, a fuel discharging pipe communicated at its one end with the fuel chamber and communicated at the other end with the outside of the pressure regulating valve, said fuel discharging pipe being provided at its one end with a valve seat against which the valve member is releasably seated, wherein when a fuel pressure in the fuel chamber is equal to or greater than a first set
  • the temperature sensitive valve located in the fuel discharge pipe is opened, and the first pressure regulating mechanism is operated to maintain the fuel pressure at the first set pressure.
  • the temperature sensitive spring formed of shape memory alloy expands to close the temperature sensitive valve and thereby close the fuel passage in the fuel discharge pipe. Accordingly, the fuel pressure in the fuel chamber is increased by the discharge pressure from the motor driven pump, and when the fuel pressure becomes the second set pressure (3.5 kg/cm 2 , for example) or more higher than the first set pressure, the high pressure valve is opened to maintain the fuel pressure at the second set pressure.
  • FIG. 1 is a diagrammic illustration of the fuel injection system for an automobile
  • FIG. 2 is a vertical sectional view of the conventional pressure regulating valve
  • FIG. 3 is a vertical sectional view of the pressure regulating valve of a first preferred embodiment according to the present invention under a normal pressure condition;
  • FIG. 4 is a vertical sectional view similar to FIG. 3 under a high-temperature high-pressure condition
  • FIG. 5 is a vertical sectional view of the pressure regulating valve of a second preferred embodiment according to the present invention under a normal pressure condition
  • FIG. 6 is a vertical sectional view similar to FIG. 5 under a high-temperature high-pressure condition.
  • reference numeral 31 designates a fuel outlet connection pipe having an end portion projecting into a fuel chamber 15.
  • the connection pipe 31 is provided at its upper end with a seat member 32.
  • the seat member 32 is formed at its upper end with an outer valve seat 32a and at its lower end with an inner valve seat 32b.
  • Reference numeral 33 designates a temperature sensitive valve formed of an inverted U-shaped cylindrical member.
  • the temperature sensitive valve 33 is arranged coaxially in the connection pipe 31 in such a manner that an upper end surface of the valve 33 is opposed to the inner valve seat 32b.
  • the upper end surface of the valve 33 acts as a valve member 33a adapted to abut against the inner valve seat 32b.
  • the temperature sensitive valve 33 is formed at its upper central portion with a fuel inlet 34 and at its side portion with plural communication holes 35. Further, the temperature sensitive valve 33 is formed at its lower opening end with plural communication holes 36 for communicating the outside of the valve 33 with a fuel outlet passage 31a of the connection pipe 31.
  • the temperature sensitive valve 33 is formed at its outer circumference with a flange 37, and a back spring 38 is inserted between the flange 37 and a shoulder formed between a small-diameter portion and a large-diameter portion of the connection pipe 31.
  • the back spring 38 operates to normally bias the temperature sensitive valve 33 in a valve opening direction and abut against a stopper 39 provided at the lower end portion of the connection pipe 31.
  • the stopper 39 has plural communication holes 44.
  • a temperature sensitive spring 40 is inserted between the stopper 39 and the flange 37.
  • the temperature sensitive spring 40 is formed of shape memory alloy functioning to expand at temperatures not less than a set temperature.
  • the set temperature is equal to a fuel temperature of 80° C. as usually obtained upon stoppage after continuous running of the automobile.
  • a spherical high-pressure valve 41 opening and closing the fuel inlet 34 is provided in the temperature sensitive valve 33 in such a manner as to be supported by a high-pressure spring 42.
  • An adjusting screw 43 is provided to adjust a spring force of the high-pressure spring 42, so that the accuracy of a set pressure may be increased.
  • the spring force of the high pressure spring 42 is adjusted to balance a second set pressure higher than a first set pressure (normally 2.55 kg/cm 2 in the prior art), so as to prevent the vaporization of the low-boiling point fuel at high temperatures higher than 80° C.
  • the second set pressure is adjusted to balance the fuel pressure of 3.5 kg/cm 2 (gauge pressure) in this embodiment.
  • the fuel fed under pressure from the fuel pump 4 is induced from the inlet connection pipe 18 into the fuel chamber 15.
  • the diaphragm 13 is displaced to balance both the above forces (see FIG. 3).
  • the valve member 21 fixed to the diaphragm 13 moves away from the valve seat 32a to allow the fuel to flow out through the fuel outlet passage 31a. Then, when the fuel pressure is decreased less than the first set pressure, the fuel outlet passage 31a is closed by the valve member 21, thereby substantially equalizing the fuel pressure to the first set pressure.
  • the temperature sensitive spring 40 expands to compress the back spring 38 and urge the valve member 33a of the temperature sensitive valve 33 against the inner valve seat 32b, thereby shutting off the discharge of the fuel.
  • the fuel outlet passage 31a is closed in this manner, the fuel pressure in the fuel chamber 15 is increased.
  • the high-pressure valve 41 having closed the fuel inlet 34 of the temperature sensitive valve 33 operates to compress the high-pressure spring 42, and is displaced as shown in FIG. 4. As a result, the excess fuel is discharged through a gap between inlet 34 and valve 41, and the fuel pressure is always controlled to be equal to a certain value.
  • the fuel pressure controlled in this way will be hereinafter referred to as a second set pressure, which is equal to 3.5 kg/cm 2 (gauge pressure) higher than the first set pressure.
  • the temperature sensitive spring 40 formed of shape memory alloy contracts.
  • the back spring 38 urges downwardly the temperature sensitive valve 33 until the valve 33 abuts against the stopper 39. Accordingly, the fuel is discharged through the outside of the temperature sensitive valve 33 and the communication holes 36 and 44 to the fuel outlet passage 31a, and is returned through the fuel return passage 10 to the fuel tank 3. Then, the fuel pressure is adjusted at the gap between the valve member 21 and the outer valve seat 32a, and is returned to the first set pressure (2.55 kg/cm 2 ).
  • the operation of the pressure regulating valve is effective between the normal set pressure (the first set pressure) and the higher set pressure (the second set pressure) during a short period of time at starting of the internal combustion engine. Therefore, such a change between the first and second set pressures does not adversely affect the running performance of the vehicle.
  • reference numeral 131 designates a fuel outlet connection pipe having an end portion projecting into a fuel chamber 115.
  • the connection pipe 131 is provided at its upper end with a seat member 122.
  • the seat member 132 is formed at its upper end with an outer valve seat 132a and at its lower end with an inner valve seat 132b.
  • Reference numeral 133 designates a high-pressure temperature sensitive valve formed of an inverted U-shaped cylindrical member.
  • the high-pressure temperature sensitive valve 133 is arranged coaxially in the connection pipe 131 in such a manner that an upper end surface of the valve 133 is opposed to the inner valve seat 132b.
  • the upper end surface of the valve 133 acts as a valve member 133a adapted to abut against the inner valve seat 132b.
  • the high-pressure temperature sensitive valve 133 is formed at its lower end with a flange 137, and a back spring 138 is inserted between the flange 137 and a shoulder formed between a small-diameter portion and a large-diameter portion of the connection pipe 131.
  • the back spring 138 operates to normally bias the valve 133 in a valve opening direction to make the valve 133 abut against a stopper 139 located at the lower end of the connection pipe 131.
  • the flange 137 and the stopper 139 are formed with communication holes 136 and 144, respectively, at the coincident positions, thereby communicating the outside of the valve 133 with the fuel outlet passage 131a of the connection pipe 131.
  • a temperature sensitive spring 140 is inserted in the valve 133 in such a manner as to be received by the stopper 139 at one end.
  • the temperature sensitive spring 140 is formed of shape memory alloy functioning to expand at temperatures not less than a set temperature.
  • the set temperature is a fuel temperature of 80° C. as usually obtained upon stoppage after continuous running of the automobile.
  • the fuel fed under pressure from the fuel pump 4 is induced from the inlet connection pipe 118 into the fuel chamber 115.
  • the diaphragm 113 is displaced to balance both the above forces(see FIG. 5).
  • the valve member 121 fixed to the diaphgram 113 moves away from the valve seat 132a to allow the fuel to flow out through the fuel outlet passage 131a. Then, when the fuel pressure is decreased less than the first set pressure, the fuel outlet passage 131a is closed by the valve member 121, thereby substantially equalizing the fuel pressure to the first set pressure.
  • the fuel in the fuel outlet connection pipe 131 is discharged through the outside of the high-pressure temperature sensitive valve 133 and the communication holes 136 and 144 to the fuel outlet passage 131a, and is returned through the fuel return passage 10 to the fuel tank 3.
  • the temperature sensitive spring 140 expands to compress the back spring 138 and urge the valve member 133a of the high-pressure temperature sensitive valve 133 against the inner valve seat 132b, thereby shutting off the discharge of the fuel as shown in FIG. 6.
  • the fuel pressure in the fuel chamber 115 is increased.
  • the high-pressure temperature sensitive valve 133 having abutted against the inner valve seat 132b to close the fuel passage is urged by the fuel pressure in the fuel chamber 115 to compress the temperature sensitive spring 140, and is displaced as shown in FIG. 6.
  • the high-pressure temperature sensitive valve 133 is moved away from the valve seat 132b, and the excess fuel is discharged through a gap between the valve seat 132b and the valve 133, making the fuel pressure always at a certain value, that is, the second set pressure of 3.5 kg/cm 2 (gauge pressure) higher than the first set pressure.
  • the fuel is discharged through the outside of the high-pressure temperature sensitive valve 133, the communication holes 136 and 144 and the fuel outlet passage 131a to the fuel return passage 10, and is returned to the fuel tank 3.
  • the temperature sensitive spring 140 formed of shape memory alloy contracts.
  • the back spring 138 urges downwardly the high-pressure temperature sensitive valve 133 until the valve 133 abuts against the stopper 139.
  • the fuel is discharged through the outside of the temperature sensitive valve 133 to the fuel outlet passage 131a, and is returned through the fuel return passage 10 to the fuel tank 3.
  • the fuel pressure is adjusted at the gap between the valve member 121 and the outer valve seat 132a, and is returned to the first set pressure (2.55 kg/cm 2 ).

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Temperature-Responsive Valves (AREA)
  • Fuel-Injection Apparatus (AREA)
US07/116,550 1986-11-07 1987-11-04 Pressure regulating valve Expired - Fee Related US4774923A (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP61-266194 1986-11-07
JP61-266195 1986-11-07
JP61266195A JPS63120857A (ja) 1986-11-07 1986-11-07 圧力調整弁
JP61266194A JPS63120856A (ja) 1986-11-07 1986-11-07 圧力調整弁

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DE (1) DE3738321C2 (de)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5237975A (en) * 1992-10-27 1993-08-24 Ford Motor Company Returnless fuel delivery system
US5337718A (en) * 1992-06-02 1994-08-16 Walbro Corporation Electronic fuel injection system with heat-pressure response
US5345963A (en) * 1993-03-31 1994-09-13 Honeywell Inc. Modulating pressure regulator with shape memory alloy actuator
FR2715196A1 (fr) * 1994-01-14 1995-07-21 Walbro Corp Régulateur de pression de carburant.
FR2721353A1 (fr) * 1994-06-21 1995-12-22 Walbro Corp Circuit de carburant sans retour pour moteur à combustion interne.
US5509390A (en) * 1994-01-14 1996-04-23 Walbro Corporation Temperature-responsive demand fuel pressure regulator
US5542395A (en) * 1993-11-15 1996-08-06 Walbro Corporation Temperature-compensated engine fuel delivery
US5782896A (en) * 1997-01-29 1998-07-21 Light Sciences Limited Partnership Use of a shape memory alloy to modify the disposition of a device within an implantable medical probe
WO1999051874A1 (en) 1998-04-06 1999-10-14 Siemens Automotive Corporation Fuel system containing a shape memory alloy
US5979409A (en) * 1998-09-22 1999-11-09 Siemens Automotive Corporation Integral returnless pressure regulator for a fuel injection system
EP0961028A2 (de) * 1994-08-27 1999-12-01 Robert Bosch Gmbh Druckregelventil
EP1591704A1 (de) * 2004-04-30 2005-11-02 Conception et Développement Michelin S.A. Fahrzeug mit gasförmigem Treibstoff und automatisches entlüftungssystem
US20110000463A1 (en) * 2009-07-01 2011-01-06 Ford Global Technologies, Llc Fuel system with electrically-controllable mechanical pressure regulator
US10352464B2 (en) * 2017-01-11 2019-07-16 Taiwan Chelic Co., Ltd. Structure of energy-saving precision pressure adjusting valve

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4928729A (en) * 1989-04-11 1990-05-29 Siemens-Bendix Automotive Electronics L.P. Fuel pressure regulator valve
DE9308900U1 (de) * 1993-06-15 1993-08-12 Gustav Wahler Gmbh U. Co, 73730 Esslingen Druckregelventil
DE19841657C1 (de) * 1998-09-11 2000-12-14 Audi Ag Anordnung mit einem Drucksensor für eine Brennkraftmaschine
US6698406B1 (en) 1999-07-24 2004-03-02 Audi Ag Pressure sensor for an internal combustion engine
WO2020227048A1 (en) * 2019-05-03 2020-11-12 Walbro Llc Low pressure fuel injection system for a combustion engine

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US4222713A (en) * 1979-05-29 1980-09-16 Caterpillar Tractor Co. Temperature responsive fuel compensator
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Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5337718A (en) * 1992-06-02 1994-08-16 Walbro Corporation Electronic fuel injection system with heat-pressure response
US5237975A (en) * 1992-10-27 1993-08-24 Ford Motor Company Returnless fuel delivery system
US5345963A (en) * 1993-03-31 1994-09-13 Honeywell Inc. Modulating pressure regulator with shape memory alloy actuator
US5542395A (en) * 1993-11-15 1996-08-06 Walbro Corporation Temperature-compensated engine fuel delivery
FR2715196A1 (fr) * 1994-01-14 1995-07-21 Walbro Corp Régulateur de pression de carburant.
US5509390A (en) * 1994-01-14 1996-04-23 Walbro Corporation Temperature-responsive demand fuel pressure regulator
FR2721353A1 (fr) * 1994-06-21 1995-12-22 Walbro Corp Circuit de carburant sans retour pour moteur à combustion interne.
EP0961028A2 (de) * 1994-08-27 1999-12-01 Robert Bosch Gmbh Druckregelventil
EP0961028A3 (de) * 1994-08-27 1999-12-08 Robert Bosch Gmbh Druckregelventil
US5782896A (en) * 1997-01-29 1998-07-21 Light Sciences Limited Partnership Use of a shape memory alloy to modify the disposition of a device within an implantable medical probe
US6039030A (en) * 1998-04-06 2000-03-21 Siemens Automotive Corporation Fuel system containing a shape memory alloy
WO1999051874A1 (en) 1998-04-06 1999-10-14 Siemens Automotive Corporation Fuel system containing a shape memory alloy
US5979409A (en) * 1998-09-22 1999-11-09 Siemens Automotive Corporation Integral returnless pressure regulator for a fuel injection system
EP1925864A1 (de) * 2004-04-30 2008-05-28 Michelin Recherche et Technique S.A. Fahrzeug mit gasförmigem Treibstoff und automatisches entlüftungssystem
US20050241693A1 (en) * 2004-04-30 2005-11-03 Conception Et Developpement Michelin S.A. Gaseous fuel vehicle and automatic vent system
FR2869573A1 (fr) * 2004-04-30 2005-11-04 Conception Et Dev Michelin Sa Vehicule a carburant gazeux et systeme de purge automatique
US7337799B2 (en) 2004-04-30 2008-03-04 Conception Et Developpement Michelin S.A. Gaseous fuel vehicle and automatic vent system
EP1591704A1 (de) * 2004-04-30 2005-11-02 Conception et Développement Michelin S.A. Fahrzeug mit gasförmigem Treibstoff und automatisches entlüftungssystem
US20080196767A1 (en) * 2004-04-30 2008-08-21 Michelin Recherche Et Technique S.A. Gaseous fuel vehicle and automatic vent system
CN1693109B (zh) * 2004-04-30 2010-06-02 米其林研究和技术股份有限公司 气体燃料车辆和自动排气***
US7748399B2 (en) 2004-04-30 2010-07-06 Michelin Recherche Et Technique S.A. Gaseous fuel vehicle and automatic vent system
US7762272B2 (en) 2004-04-30 2010-07-27 Conception Et Developpement Michelin S.A. Gaseous fuel vehicle and automatic vent system
US20110000463A1 (en) * 2009-07-01 2011-01-06 Ford Global Technologies, Llc Fuel system with electrically-controllable mechanical pressure regulator
US8210156B2 (en) * 2009-07-01 2012-07-03 Ford Global Technologies, Llc Fuel system with electrically-controllable mechanical pressure regulator
US10352464B2 (en) * 2017-01-11 2019-07-16 Taiwan Chelic Co., Ltd. Structure of energy-saving precision pressure adjusting valve

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DE3738321A1 (de) 1988-05-19
DE3738321C2 (de) 1995-06-29

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